Strpbrk and strspn in C

main.c

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

int main(int argc, char* argv[]) {
    char str[] = "Daniel is 25 years old";
    char* age = strpbrk(str, "0123456789");
    
    printf("%s\n", age);
    for (int i = 0; i < strspn(str, "0123456789"); i++) {
        printf("%c", age[i]);
    }
    printf("\n");
    return 0;
}